661152 has 48 divisors (see below), whose sum is σ = 1778112. Its totient is φ = 215040.

The previous prime is 661139. The next prime is 661183. The reversal of 661152 is 251166.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6768 + ... + 6864.

It is an arithmetic number, because the mean of its divisors is an integer number (37044).

2⁶⁶¹¹⁵² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (889056).

661152 is an abundant number, since it is smaller than the sum of its proper divisors (1116960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661152 is a wasteful number, since it uses less digits than its factorization.

661152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181 (or 173 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 661152 is about 813.1125383365. The cubic root of 661152 is about 87.1165039776.

The spelling of 661152 in words is "six hundred sixty-one thousand, one hundred fifty-two".